Synaptic protection via microglial/complement normalization

Proposed by etl-backfill

TREM2/complement cascade neurodegeneration market 57% proposed
Compare across mechanisms →
Composite
56%
Novelty
50%
Feasibility
60%
Impact
65%
Mechanistic
58%
Druggability
50%
Safety
55%
Confidence
55%

Mechanistic description

Cancer-induced cystatin C prevents complement-mediated synaptic loss through TREM2-mediated microglial phenotype regulation, reducing C1q/C3 deposition and excessive pruning. This is clinically important but probably secondary to plaque remodeling plus microglial state change rather than a distinct mechanism. Synaptic biomarkers are noisy and slower-moving than amyloid PD markers, making mechanism proof difficult in humans.

Mechanism / pathway

  1. TREM2/complement cascade
  2. neurodegeneration

Evidence for (3)

  • TREM2 deficiency causes abnormal synaptic pruning and memory deficits

    PMID:29991702

  • Cystatin C prevents excitotoxic synapse loss in vitro

    PMID:20127989

  • Complement inhibition reduces synaptic loss in AD mouse models

    PMID:30867593

Evidence against (2)

  • TREM2 loss-of-function shows baseline requirement, not that activation improves pruning

    PMID:29991702

  • Cachexia confounding in cancer-bearing mice may affect synaptic plasticity independently

    PMID:NA

Evidence matrix

3 supporting 2 contradicting
55% posterior support

Supporting

  • TREM2 deficiency causes abnormal synaptic pruning and memory deficits PMID:29991702
  • Cystatin C prevents excitotoxic synapse loss in vitro PMID:20127989
  • Complement inhibition reduces synaptic loss in AD mouse models PMID:30867593

Contradicting

  • TREM2 loss-of-function shows baseline requirement, not that activation improves pruning PMID:29991702
  • Cachexia confounding in cancer-bearing mice may affect synaptic plasticity independently PMID:NA

Bayesian persona consensus

55% posterior support

1 signal · 1 for / 0 against · agreement 100%

scidex.consensus.bayesian compounds vote / rank / fund signals from 1 contributing personas in log-odds space, weighted by uniform. Prior 50%.

Cite this hypothesis

Cite this hypothesis
Citation

etl-backfill (2026). Synaptic protection via microglial/complement normalization. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-2416d8f8d2

BibTeX 
@misc{scidex_hypothesis_h2416d8f,
  title        = {Synaptic protection via microglial/complement normalization},
  author       = {etl-backfill},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-2416d8f8d2},
  note         = {SciDEX artifact hypothesis:h-2416d8f8d2}
}

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